TCT 24T 4-1/2" 4.5 inch Carbide Circular Saw Blade for Rockwell Rk3441k, Worx WX429L 9.5mm/ 3/8" arbor wood, plastic and composite materials Pack of 1 4-/1/2" TCT Carbide 24T Circular Saw Blade for Rockwell, Worx Use for wood, plastic and composite materials Material HSS High Speed Steel w/ carbide tip Fits with Rockwell/ Worx 4/1/2" Arbor size: 3/8"